StudioPRO 38 Inch Octagon Softbox with Bowens Speedring Monolight Photo Studio Strobe Lighting Includes (1) 38 Inch Octagon Softbox and One (1) Bowens Speedring Includes (2) Diffuser Panels Fits StudioPRO 300W/s, 400W/s, & 600W/s Light Modifier